feat(verkle): add parent root to witness

[spencer-tb]

🗒️ Description

Add the parent_root to the witness in the verkle fixtures.
Fixes a bug in the verkle_proof where the depthExtensionPresent field was creating non-zero padded values in some instances. These are now zero padded.

Requires this commit when fill with geth: spencer-tb/go-ethereum@1b5cd40#diff-06c63748460168e12cbf03984f37c000908e0b7ff50ca0dfe28db286a1dfd36eR395

🔗 Related Issues

N/A

✅ Checklist

• All: Set appropriate labels for the changes.
• All: Considered squashing commits to improve commit history.
• All: Added an entry to CHANGELOG.md N/A.
• All: Considered updating the online docs in the ./docs/ directory.